A video of American R&B singer Ne-Yo kissing three of his girlfriends backstage has had loads of attention and highlighted the practice of polyamory. This is when people have several partners at once and are completely open about it. To find out more, we bring together four polyamorous men and women in the US and the UK to tell us what their lives are like. Apart from the positives, we also hear about the stigma and the jealousy that can arise from having more than one partner.